// For flags

CVE-2021-21322

Prefix escape

Severity Score

9.8
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

fastify-http-proxy is an npm package which is a fastify plugin for proxying your http requests to another server, with hooks. By crafting a specific URL, it is possible to escape the prefix of the proxied backend service. If the base url of the proxied server is `/pub/`, a user expect that accessing `/priv` on the target service would not be possible. In affected versions, it is possible. This is fixed in version 4.3.1.

fastify-http-proxy es un paquete npm que es un plugin fastify para enviar sus peticiones http a otro servidor, con hooks. Al diseñar una URL específica, es posible escapar el prefijo del servicio del backend proxy. Si la URL base del servidor proxy es "/pub/", un usuario espera que no sea posible acceder a "/priv" en el servicio objetivo. En versiones afectadas, es posible. Esto es corregido en la versión 4.3.1

A flaw was found in fastify-http-proxy. Escaping the prefix of the proxied backend service is possible by an attacker using a specially crafted URL. The highest threat from this vulnerability is to data confidentiality and integrity.

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
None
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
Partial
Integrity
Partial
Availability
Partial
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2020-12-22 CVE Reserved
  • 2021-03-02 CVE Published
  • 2024-07-20 EPSS Updated
  • 2024-08-03 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-20: Improper Input Validation
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Fastify-http-proxy Project
Search vendor "Fastify-http-proxy Project"
 Fastify-http-proxy
Search vendor "Fastify-http-proxy Project" for product "Fastify-http-proxy"
 < 4.3.1
Search vendor "Fastify-http-proxy Project" for product "Fastify-http-proxy" and version " < 4.3.1"
node.js
Affected